If it matters to you, value will increase when seen through your eyes.

Market value is a different story, though.

Prospective buyers are not always as enthusiastic about options and after market gizmos as you might be. Quite some (especially those who like Q-cars [all go and no show]) will prefer to get the original parts (OEM) retrofitted, especially if the mods aren't street legal or experienced by them as a nuisance (too loud, to 'screamy', etc.) or simply because resale policy does not allow mods (for example resale to an official dealer in exchange for a new car). Keep the original parts for possible retrofitting. At resale day you might part out the mods to enthusiasts willing to pay a decent price for it.

Also, prospective buyers might associate 'modded' cars with a certain driving style and approach/philosophy which possibly affects the longevity and integrity of the car parts (perception/prejudice regardless of the real status of the car).

Thanks for all the feedback. It is very helpful. I can't say I'm planning to sell the car but I will get the bug for something else eventually. It's really nice to have some equity in a car for once and I don't want to blow that

Equity in a car? LOL People have to realize 1M is not an investment vehicle stop trying to resell it to make money and start appreciating the car for what it is

My tag renewal notice says that I have a M1.

This thing is already worth 4 times what I paid for!!!!

Sweet.

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The 1 series M is the most badass, coolest, sickest BMW to debut since the 1988 M3. The E30 M3 finally has a successor. Please welcome the stupidly fast, wickedly tempered, awkwardly named, possibly perfect little son of a benchmark - Automobile Magazine, August 2011

314 million in the USA.
Conservatively 780 out of 790 still on the road or in the country.
That's one car for every 402,000 and change for each person here.

Take care of it and you'll see minimal depreciation and perhaps a nice bump in value in a couple of decades. It's not a 1989 Porsche 911 Speedster, but it is rarer. If you want it to remain collectible, then I think you will have to keep the car largely unmodified.